I'm returning to this post because the other one's have strayed off. Sorry about that.

What I originally meant to say is, that I like string values to be shown in exactly the same way wherever they are located. If I use quotes to denote them then this is guaranteed.

You were asking about a team and that means it's possible the members are using different IDE's / editors. If the coding convention makes it easier to look over one's shoulder and see roughly the same patterns in syntax-highlighted code then that's a win in my book. (It doesn't really matter what the actual colors are, the pattern is important.)